Disable flaky test: LoggedInSpokenFeedbackTest.LearnModeHardwareKeys

TBR=dtseng@chromium.org

No-Try: true
Bug: 1111686
Change-Id: I926c72b00f1424dadef75fd47dcc652c9dd0e12c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332277Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793534}

chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc

@@ -230,7 +230,10 @@ IN_PROC_BROWSER_TEST_F(LoggedInSpokenFeedbackTest, NavigateNotificationCenter) {
 
 // Test Learn Mode by pressing a few keys in Learn Mode. Only available while
 // logged in.
-#if defined(MEMORY_SANITIZER)
+//
+// Disabled on msan: https://crbug.com/1111575.
+// Disabled on debug build: https://crbug.com/1111686.
+#if defined(MEMORY_SANITIZER) || !defined(NDEBUG)
 #define MAYBE_LearnModeHardwareKeys DISABLED_LearnModeHardwareKeys
 #else
 #define MAYBE_LearnModeHardwareKeys LearnModeHardwareKeys